Hach D5500 Série Manuel De L'utilisateur page 12

Operation
User navigation
Refer to the controller documentation for keypad description and
navigation information.
Configure the sensor
Use the Configure menu to enter identification information for the sensor
and to change options for data handling and storage.
1. Push the MENU key and select Sensor Setup, [Select Sensor],
Configure.
2. Use the arrow keys to select an option and push ENTER. To enter
numbers, characters or punctuation, push and hold the UP or DOWN
arrow keys. Push the RIGHT arrow key to advance to the next space.
Option Description
EDIT NAME Changes the name that corresponds to the sensor on the
top of the measure screen. The name is limited to 10
characters in any combination of letters, numbers, spaces
or punctuation.
SENSOR S/N Allows the user to enter the serial number of the sensor,
limited to 16 characters in any combination of letters,
numbers, spaces or punctuation.
MEAS UNITS Changes the measurement units—ppm (default), mg/L or %
saturation
ALT/PRESS Sets the units for atmospheric pressure or altitude—mmHg
UNITS (default), ft, m, mbar, kPa or inHg.
ALT/PRESS Sets the value of the atmospheric pressure or altitude for
the geographic location where the sensor is used (default:
760 mmHg). This value is necessary for calibration when
the Air Cal or Saturation Cal procedure is used.
TEMP UNITS Sets the temperature units to °C (default) or °F
SALINITY Sets the units for salinity—mg/L, mMol/L or mS/cm (default)
UNITS
12 English
Option Description
SALINITY Sets the salinity value of the water used for calibration
(default: 0 mS/cm). This value is necessary when the
Saturation Cal procedure is used.
TEMP Changes the temperature element for automatic
ELEMENT temperature compensation—NTC 30K (default) or manual.
If no element is used, the type can be set to manual and a
value for temperature compensation can be entered
(manual default: 25 °C).
FILTER Sets a time constant to increase signal stability. The time
constant calculates the average value during a specified
time—0 (no effect, default) to 60 seconds (average of signal
value for 60 seconds). The filter increases the time for the
sensor signal to respond to actual changes in the process.
LOG SETUP Sets the time interval for data storage in the data log—5, 30
seconds, 1, 2, 5, 10, 15 (default), 30, 60 minutes.
RESET Sets the configuration menu to the default settings. All
DEFAULTS sensor information is lost.
Calibrate the sensor
About sensor calibration
The sensor characteristics slowly shift over time and cause the sensor to
lose accuracy. The sensor must be calibrated regularly to maintain
accuracy. The calibration frequency varies with the application and is best
determined by experience.
Three methods can be used to calibrate the sensor:
• Air Cal (recommended)—the sensor is removed from the process and
placed in a calibration bag. The calibration bag provides a stable
environment for water-saturated air. The instrument uses the user-
entered atmospheric pressure or altitude and the temperature to
determine the reference value.
• Sample Cal—the sensor remains in the process sample. The reference
value is determined with a secondary verification instrument or titration.
• Saturation Cal—the sensor remains in the process sample. The
process sample must be aerated or known to be saturated with air. The